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Packet satellite technology reference sources (RFC0829)

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V.G. Cerf: AUTHOR

Abstract

This paper describes briefly the packet satellite technology developed by the Defense Advanced Research Projects Agency and several other participating organizations in the U.K. and Norway and provides a biblography of relevant papers for researchers interested in experimental and operational experience with this dynamic satellite-sharing technique.

Country

United States

Language

English (United States)

This text was extracted from a ASCII document.

This is the abbreviated version, containing approximately 27% of the total text.

Network Working Group V. Cerf

Request for Comments: 829 DARPA

November 1982

PACKET SATELLITE TECHNOLOGY REFERENCE SOURCES

Vinton G. Cerf

Defense Advanced Research Projects Agency

ABSTRACT

This paper describes briefly the packet satellite technology developed

by the Defense Advanced Research Projects Agency and several other

participating organizations in the U.K. and Norway and provides a

biblography of relevant papers for researchers interested in

experimental and operational experience with this dynamic

satellite-sharing technique.

INTRODUCTION

Packet Satellite technology was an outgrowth of early work in packet

switching on multiaccess radio channels carried out at the University of

Hawaii with the support of the Defense Advanced Research Projects Agency

(DARPA). The primary difference between the earlier packet-switched

ARPANET [1, 2] and the ALOHA system developed at the University of

Hawaii [3] was the concept of multiple transmitters dynamically sharing

a common and directly-accessible radio channel. In the ARPANET, sources

of traffic inserted packets of data into the network through packet

switches called Interface Message Processors (IMPs). The IMPs used high

speed point-to-point full-duplex telephone circuits [4] on a

store-and-forward basis. All packet traffic for a given telephone

circuit was queued, if necessary, in the IMP and transmitted as soon as

the packet reached the head of the queue. On such full duplex circuits

there is exactly one transmitter and one receiver in each direction.

The ALOHA system, on the other hand, assigned a common transmit channel

frequency to ALL radio terminals. A computer at the University of

Hawaii received packet bursts from the remote terminals which shared the

"multi-access" channel. Under the control of a small processor, each

terminal would transmit whenever it had traffic, and would await an

acknowledgement, on another frequency, dedicated to the service host. If

no acknowledgement was received, the terminal processor would transmit

again at a randomly chosen time. The system operated on the assumption

that no store-and-forward or radio relay was needed. The University of

Hawaii researchers later demonstrated that the ALOHA concept worked on a